We got a backend server in a specific ISP with a reverse proxy frontend in a different ISP. In order to send mail we use the backend server which connects to a frontend sendmail SMTP server. The problem is that we do not want the backend server to be public for the e-mail receiver, like it currently happens:
Received: from smtp.ourdomain.com (thebackendserver.com [BA.CKE.ND.IP]) (authenticated bits=0) by smtp.ourdomain.com (8.13.8/8.13.8) with ESMTP id oBE2K1NT020323 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 14 Dec 2010 08:20:05 +0100
Any solution for this?
Thanks in advance